RFR: 8286850: [macos] Add support for signing user provided app image

[Alexey Semenyuk]

On Thu, 2 Jun 2022 05:17:25 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

> - Added support for signing predefined application image.
>  - Following command can be used to sign predefined application images: jpackage --type app-image --app-image Test.app --mac-sign [additional signing options]
>  - Main class and if --mac-app-store was specified will be saved in .jpackage.xml. Both values are required for signing. Main class is to generate default identity and --mac-app-store to do correct signing for App Store.
>  - Signing is done exactly same as when generating app bundle. Unsigned, signed or partially signed app images are supported. App image will be completely unsigned before signing.

test/jdk/tools/jpackage/macosx/SigningAppImageTwoStepsTest.java line 69:

> 67:         SigningCheck.checkCertificates();
> 68: 
> 69:         Path appimageOutput = TKit.workDir().resolve("appimage");

This should be `TKit.createTempDirectory("appimage")` to allow subsequent invocations of the test to create a new "appimage" directory if the test work directory already contains "appimage" directory from the previous test run.

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PR: https://git.openjdk.java.net/jdk/pull/8987